Thermostat.



J. H. BRADY.

THERMOSTAT.

APPLICATION FILED 0011.21, 1907.

Patented. Nov. 2, 1909.

.jing/M fz mug@ ,2 y, lf Xgl? y UNITED S'IATES PATENT- QFFCE.

JOSEPH H. BRADY, 0F KANSAS CITY, MISSOUR.

THERMOSTAT.

Specification of Letters Yatent.

Patented Nov. 2, 1909- .Application filed October 21, 1907. Serial No.398,315.

perature of apartments by controlling theheating or the ventilatingapparatus thereof.

My invention embraces a valve mechanism for controlling the flow of asuitable motive fluid employed in communicating the action of thethermostat to the regulating valve of the apparatus; and one object isto arrange the valve mechanism on a base so that it may be removed fromthe thermostat intact when it is desired to adjustor repair said valvemechanism.

A further object is to provide simple means for imparting a long` stroketo the valve of the thermostat, and with this end in View I employ twomedia upon which n rising temperature hasI the opposite eli'ects ofexpanding one and contracting the other.

. These media are arranged to move in the same direction when alt'ecledby variations in temperature, and one of them is connected to the freeend of the other and the valve mechanism so that the combined movementsof the media will be transmitted t-o said valve mechanism.

In order that the inventionmay be fully understood reference will now bemade to the accompanying drawing,'in which z* Figure 1 represents anirregular vert-ical section of the thermostat on line l-l of Fig. 2.Fig. 2 is a side elevation of the same, partly in section on line IP-IIof Fig. l. Fig. 3 is a transverse section on line lll-- Ill of Fig. l.Fig, a is a plan view of the thermostat with its cover removed to showan indicator whereby the thermostat `set to act at a certaintemperature.

In carrying out the invention, l employv a bracket 1, provided at itshorizontal portion with a circular shoulder 2, which is threaded toreceive the threaded lower end of .a chamber 3, wherein the valvemechanism of the thermostat is inclosed to protect it from injury orfrom being ytampered with. The upper edge of the chamber wall has anannular ffroove 4 forming a seat for the lower end of a tubular medium5, which is drawnV rmly to its seat by screur-threads 6. Medium 5consists of'ebonite' or other material, which will expand when subjectedto a rising temperature, and being' firmly secured at its lower end itis obvious that any movement caused by expansion will be up,

ward. The upper lfree end of medium 5 is closed by an annular cap 7having a peripheral flange 8, which is adjusted tlghtly into contactwith the upper end of the medium to form an air-tight joint. The uppervendvof cap 7 is normally closed by a removable.

chamber 3 and adapted to be connected atv its outer end to a pipeleading from the source of motive fluid not shown. Pipe 10 enterschamber 3 through bracket l terminates in a goose-neck 11, provided atits discharge end with a nipple 12 having a valve-seat in its lowerterminal.

13 designates a tubular screw'extenidmg into chamber 3 through thehorizontal portion of the bracket and provided at its upper terminalwith a valve-seat arranged in ver tical alinement with the valve-seat innipple 12.

14 designates a valve having attenuated terminals adapted to alternatelyengage thel valve-seats for the purpose of shutting ott the [low offluid into chamber 3 and medium 5, or permittingV its escape from thesame, after beine` used, through the exhaustport 15 extending' throughscrew 13, which latter may be adjusted toward or away from the valve totime the seating of the same. Nipple 12 is likewise adjustable on thegooseneck for the same purpose.

Valve 1st is pivoted to one end of a lever 16, fulcrume-d between thejaws 17 of a stem 1 8 and arranged in about the proportioirof to one, sothat its valve-carryirrg end will have considerable more' throw than itsopposite end.

19 designates another stem having a pair of jaws 20, between which thelever extends so that the same cannot move laterally and ing preferablyof the following ingredients; nine parte lead, two parte antimony,and'one part bien'iuth. Said medium extends lnpwardly into medium 5where it is provided With a guidedisl which loosely engagea the innervertical surface of .medium The upper end et medium .21 has a tl'ireadedhere 2% for the reception of the lower end of a screw extending upwardthrough cap T and provided with a pointer 2G, 'which in conjunction witha circular 2i", stamped on the Cap, forms an indicator for setting thethermostat to act. at any desired degree of temperature. Pointer QGrests upon. a sleeve 28 and fits upon the rectangular portion 29 ofscrew 25, so that when. it is turned te the right orlet't it will turnthe screw therevith and ez ufo it to raise or lower medium 2l for thepurpose of adjusting' Valve 14 in proper relation to nipple l2 andtubular ser/eu7 13. Screw 25 is prevented from moving` upv or down withmedium 2l hy an integral shoulder SO, engaging' the underside of eap?,and a nut 3l on the npper end ofrscrew Q5, hearing upon a Washer 32interposed between the cap and the pointer.

33 designate` an outlet pipe leading,y from chamber 3 to the valve ofthe heating, or Ventilating` apparatus, t not shown).

i-issurnineV that the thermostat has heen setto :1ct at seventy degrees,medium 5 will expandv and lift medium 2l when' the teinperature risesabove this point. Medium 2l. Will in turn contract and the nieve-@nentof the media is upward valve lflwill be unseated i'roxn nipple l2 andseated in screw l, eo that. the.. motive Huid will he tree to enterchamber 3 and niediuin and [low thence through pipe to the valve of theappura tus which is thereby closed and shuts oif the heating' agent-.When the temperature fallei below seventy degrees medium 5i cont 'actsVWhile medium 2l expanda/so that the con)A bined movements of both-willseat valre ll in nipple 12 anduncover port l5. The motive fluid inchamber 3 and medium 5 will then exhaust through port l5 and Ipermit thevalve of the apparatusto open. Fur- ,ther expansion or contraction ofthe media ai'terfvalve le has become seated is permitted by medium 21which is curved at 21 so that ih may yield more or less. f

Pipes 10, 33, screw 1B, and the valve Ineehy anisrn is carried bybracket l so they may he removed together with said bracket when it isdesired to repair or adjust any of the parte, und in order to effectthis removal it is' only "necessary 4to disconnect screw Q5 from `medium2l, or unscrew nut 3l from .the upper end of screw 25 so that medium' Qi`mny be removmlwith brackets l and the parte carried thereby. lVhen theparts leplucqpl guide centers the upper end of medium YI nuthin medium.e0 that 1t may be en by the screw or if' Said screw be removed with thedium the guide will hold the screw in line with. the central open ing ineap 7 so that the screw will reaelily enter id opening. A

llavine thuis described my invention, what .l claim W l.; n thermostatconeietin oi a hollow niediuni which. expande under a riaing temperatnre, a chamber communicating with the lower end et said niedinnn uninlet pipe 'for conductingv motive .tlnid to vid chamber, terminati: ina goosenecli having a valve seat in it tering the chamber having anenanst-pert and a valveseat in axial line ivigh the iirstnientiemxdvalve-seat, a valve for alternately ing the ralrescata a second inediuinwhich contracts under a rising temperature and connected. at its ends tothe free end of the tiret niediuni and the valve, so that the addedmovements of the niedia will be transmitted to :raid valve, and anoutlet pipe for conducting the inotire luid ironi. the chainber to thepoint ot nee.

9.. A thermostat consisting oit' a hollow inediuln which expande under arising temu Jerature, a chai'nber cennniunioatinr with the loner end oitSaid medium, an inlet pipe t'or conducting motive lluid to Said chamber,ter- Initiating in a gooee--ileek,` a member adjustahly engaging one endof Said gooseneclr and terminating in a valve-seat7 a screw entering theeinher having' an exhaustport and a Valve-Seat in axia line with thetirstnnentioned valveseat, a twoefaeed valve for altmnately eiigagingthe vali/escats5 a lever to one end ot which said valve is pivotved, usecond medium which contracte under a fising temperature and isconnected at its and outlet pipes for tendnoting` motive fluid to andfrom th chamber, and having an eX- haust port. leading from the chamber,said 1 inlet pipeentering Suid chamber' adjacent said exhauet port andbeing .irovided with a mouth suspended concentriezdly opposite saidexhaust port, a Avalve having opposite faces adapted to alternatelyclose the inlet pi e and the exhaust port7 means for holdingtiie inletand outlet pipes and the valve meehanisrn from which the expansihlemedium may be removed and means connecting the valve to the tree end ofthe medium.

e. A thermostat conaiat-inl;c of a hollow medium which expande under arising tempera? ture and ie provided at ite` upper engi? with lowntnrnedendTv a member ena second medium contractible as saidfirst an annularscale, a removable base having a cylindrical extension supporting saidhollow medium and forming a closed chamber therewith, Valve mechanismcarried within said extension, and means connecting said valve mechanismwith lsaid expansible medium, said valve mechanism comprising a goosenecked inlet pipe provided at its downturned end with a valve seat, anadjustable exhaust port pipe also provided with a valve seat inaxialalinement with said inlet valve seat, an outlet pipe and a two wayvalve plug operable by said connecting means to alternately open andclose said inlet and exhaust port pipes.

5. A thermostat consisting. ot' a hollow medium which expands under arising temperature, bodily removable valve mechanism supported at oneend of said medium within a chambered base, and means connecting saidmedium with said valve mechanism whereby to utilize the expansion andcontraction of said medium to operate said valve mechanism, sa'id valvemechanism comprising an inlet pipe having a downturned adjustable valveseat, an exhaust port pipe also provided with a valve seat disposedoppositely to said inlet valve seat, an outlet pipe and a valveoperating. between said exhaust port and inlet valve seats toalternately open and close said outlet and inlet, with the expansion andcontraction of said medium.

A thermostat comprising an expansible medium, a chambered base at itslower end, the chamber thereof being open to said medium, valvemechanism inclosed by said chambered base, said valve mechanismcomprising outlet, inlet and exhaust pipes, said inlet and exhaust pipesbeing concentrically and oppositely disposed, a valve operative betweensaid inlet and exhaust pipes and a pivoted lever adapted to move saidvalve,

medium is expansible supported by said irst I medium at its upper end',and connecting it with said valve mechanism whereliy to utili ize theresultant of their added movements when affected by heat to operate saidvalve.

7. A thermostat comprising a medium expansible under caloric iniuence, asecond medium contractible when said first medium is expansible andvalve mechanism supported in operative relation thereto, said valvemechanism comprising outlet, inlet and exhaust pipes, said inlet andexhaust pipes being concentrically and oppositely disposed, a valveoperative between said inlet and exhaust pipes, anda pivoted leveradapted to move said valve, whereby the resultant of their addedmovements when affected by caloric influence may be utilized to operatesaid valve mechanism.

8. A thermostat comprising in combination with a hollow mediumexpansible under action of heat,` a base portion supporting said mediumand comprising a' chamber,

valve mechanism mounted in said chamber .comprising an inlet, outlet andan exhaust.

ort pipes, anoscillating valve operating )etween said inlet and exhaustport pipes, and a second medium contractible under the action of heat,said second medium connecting said first medium. with said oscillatingvalve whereby to utilize the resultant of the added movements of saidmediums under the action of heat to operate said valve, said secondmedium comprising a rodconnected at its upper end to the upper end ofsaid first `medium and connected at its lower end to said oscillatingvalve, and having means for adjusting said rod at its upper end and-having intermediate its .length an ott'set portion whereby tocompensate tor the expan-' sion of said medium after said valve isseated. A

In testimony whereot I attix my signature` in thil presence of twowitnesses.

'JOSEPH Il. BRADY.

W'itnesses F. Gr. Fisonlcn, M. Cox.

